Drilling mechanism



Feb. 2 6, 1929.

E. G. GARTIN DRILLING MECHANISM Filed Dec. 2l. 1922 Patented Feb. 26,1929.

Erima G. eAR'rIN.k or CLAREMONT, NEW' 'HAMrsirIRn As'sIGNoR "ro sULLrvANPATENT 'fogFF lcE-.

MACHINERY COMPANY, A CoRP'oBA'rioN vor MASSACHUSETTS.

` DRILLING MECHANISM.

i Application led December 21, 1922. .Serial No. 608,307. .A

tion of the drill steel. Other objects and advantages of my inventionwillhereinafter more fully appear. Y

In the accompanying drawings I have shown for purposesof illustrationone form which my invention may .assume in practice.

.In these drawings,-. p

Fig. 1. isa central `longitudinal section through the illustrativeembodiment of my invention. Y Y y Fig. 2 is a transverse sectional viewtaken on line 2-,-2 of Fig. 1. f

My invention has been shown forpurposes of illustration embodied inapercussive drilling apparatus which is generally designated 1 and whichincludes a cylinder member 2 in whose bore 3 a ypiston 4 isreciprocable, this piston beingadaptedto be reciprocated by fluidpressurel admitted thereto through inlet ports 5 and 6 and distributedby a groove 7 formed in the piston to passages 8 and 9 opening into thebore of the cylinder at appropriate places. It will be noted that the Ypassage 9 opens into the borepof the cylinder at -the extreme end of thelatter aswell as at other suitable and usual points, the rearmost pointof' communication being designated 10.l `The piston 4 is herein alsoproerate with a portion v16 of the chuck mechanis'm sothat rotation ofthe steel is impossible except asvthe chuckis rotated. Y

In my improved construction, the cylinder Amember 2 is provided With' arear head 18 through which a passage 19 opens, this passagecommunicating with a cylinder Lbore or chamber 20 formed in a member 21arranged at the rear end of the cylinder member 2. The opposite end ofthe chamber 20 is closed by a head 22 through which an opening 23 isformed and through this opening a short 'piston rod 24 formed on apiston 25 reciprocable in the chamber or cylinder 20 is movable. Aspline and key connection, asindicatedat 26, prevents rotation of thepiston 25 as the latter'r is reciprocated. The piston rod 24 islikewiseprovided with one or morespiral grooves 27with which spiral keys27 formed on a pawl carrying member 28 are'l arranged to cooperate.YThepawls on said pawl carryF ing vmember are adapted `to engage, as inany usual and well known construction, internal teeth 29 on a gear 30which is rotatable ina chamber31 to the rear of the cylinder 20. Thegear meshes with a smaller gearv 32 which is mounted u pon a tubularshaft 32',

Ywhich is engaged by a dent-al clutch 33 with a second tubular-shaft 34.This last shaft carries at' its front end a pinion 35 which l41 in thepiston rod -24 and the recess 40 receiving theannular piston rod 24. Avent 42 permits .the free movement of the piston rod in the vrecess 40.Air is adapted 'to be constantlysupplied during drilling through the[passa-ge 45V and around the outside of the cleansing fluid supply tube46, which last is supported in the end member 38. It will thus Lbeevident that the pressure fluid lsupplied throughrthe passage 45 andaround the tube 46 exerts a constant pressure tending to force v thepiston 25 toward theright, or forwardly. vided with a nose or strikingmember 12 A which passes throughan opening 13 in the It will, moreover,be evident that, each time g that admission occurs to the rear end ofthe .cylinder 3 therewill be admissionY throu h the port 19 to thecylinder 2O at the rig t hand side'of the piston 25 in such manner that.meshes with a gear 36-formed on. a chuck 1 :rotating sleeve 37. A rearhead member 38 this piston vwill move toward the left due to the actionof' the-air upon the greater area of the end ofthe piston 25. It will benoted that the vent 42 likewise .vents the space to the left of thepiston 25 in the chamber 20 by way vof. the straight and spiral groovestermed in the piston 'rod 24. Itwill be. observed that Vsuitable siderods 47 and 48,v the latter of` Y which forms a bearingfor the tubularshafts 32 and 34, maintain the parts of the drill in assembled relation.i Y

From the foregoing description the inode of operation of this mechanismwill be clearly apparent. Air having been admitted to the i from theVright hand endV of the cylinder and accordingly the piston will bealternately moved yin opposite directions by the air admitted throughthe port 19 and by the constant air pressure act-ing in the chamber '41.j As the piston 25 reciprocates, the spiral grooves will also os'cillatethe pawl carrying member 28 and this, as it oscillates, will causeprogressive rotation ofthe gear 30', Vwhich will in turn drive thelpinion 31 and so, vthrough'the shafts 32 and 34, the pinion 35, andthepinion 36 will drive the chuckvcarrying member 37' and so cause rotationof the drill steel.

that'I have produced a very compact-and ef7 ficient construction.

Y While I have in this application specifically described `one formwhich my invention may assume in practice, it will be understood thatthis form of the same is'shown for purposes of illustration and that theinvention may be modified and embodied in other forms Without departingfrom its spirit or the scope of the appended claims. Y v

What I claim as new and desire'to secure by Letters Patent is: Y j

1.V In a rock drilling mechanism, a percusysive motor to actuate a drillsteel, and drill steel rotation mechanism including a cylinder having apiston reciprocable therein and disposed yat the rear end of saidpercussive4 motor, a common head for said cylinder and motor, a

`motive Huid conducting passage in said head allowing constantcommunication between the adjacent ends of said cylinder and motor, and

means for controlling the reciprocation of said piston by saidpercussive motor.

2.- In a rock drilling mechanism,a percus sive motor, a steel chuckcarried at 'the front end thereof and a steel rotation motor carried atthe rear end thereof comprising'a piston and cylinder, said pistonVhaving a tail rod,

rotation mechanism associated with said tail rod for rotation therebyand including a rotate1 able side'rod and afplurality of meshing gearsone of which is attached to said side rod, and

ldriving connections between said side rod and said chuck.

3. Ina drilling mechanism, ay percussive motor, a'steel chuck, arotation motor therefor comprising a cylinder, and piston therein,

at-ail rod carried by said piston, a rear head It will thus be seen thatI-have y Vvprovided coaxial percussive and drill rotat-V ing motorsbothvof the reciprocatory type and carried by saidcylinder through whichsaid tail-rod and including a pawl an-d ratchet mechanism Adisposedadjacent said head and a vshaft disposedV substantially lparallel tosaid percussive motor. j

' 4. In a rock drilling mechanism, a cylinder and piston, said pistonhaving a reduced hollow extension, a member telescopingwith the hollowportion thereof, means for subjecting said hollow portion to constantlive pressure fluid during all movements of said piston and tovent'oonstantly the end of the cylinder in whichV said extension isdisposed, and means for intermittently subjecting the other. end of thecylinder to'live pressure fluid to cause reciprocation of said piston.

5. In a rock drilling mechanism, a drilling iiiotorhaving a casingproviding a cylinder bore, a piston therein, a drill steel actuated bysaid motor, a vdrill steel rotation motor having a separate cylinderwith a reciprocable piston therein, means for subjecting a portion`offoneV end of said latter piston to constant thereof, and tosimultaneously Vvent the adj acent en-d of the rotation motor cylinder,and means for intermittently subjecting the other end of said rotationmotorpiston to live presing and alined witlithe longitudinal centerthereof, said piston having Ymeans cooperating' with and extendingthrough said intermediate head member, ratchet andA pawl mechanismdisposed in said rear head element and with which said pistoncooperates,'and operative connections between said ratchet andV pawlmechanism and said Vchuck for rotating the latter. Y Y

7. In a; drilling mechanism, a drilling motor including a cylinder andpiston and a rotatable drill steel receiving chuck, rotation rmeans forsaid cliiickcoinprising a recipro- ,cable .pistonv arranged coaxiallywith said live pressure fluid during all movements llO motor, aratchetand pawl mechanism operated by said last-mentioned pist-on, a gearconcentric with said ratchet and pawl mechanism andV actuated thereby, a:cooperating gear meshing therewith, and transmission means between saidlatter gear and said chuckin- `cluding a transmission shaft disposedparallel with the longitudinal axis Vof said drilling motor. Y

8. Ina rock drilling mechanism, a percussive motor having a relativelystationary cylinder, a piston reciprocating in said cylinder in contactwith the walls thereof and fluid distribution means for regulating thepassage of a working fluid through t-he motor to effect reciprocation ofsaid piston, a` drill steel percussively actuated by said motor, meansfor rotating said drill steel comprising a cylinder and piston motorhaving its axis alined with the axis of said percussive motor andarranged at the rear end thereof, and opera-- tive driving connectionsbetween said motor and the drill steel including a rotating elementextending longitudinally of themachine, said fluid distribution meansfor said percussive motor also controlling said rotation motor;

9. In a rock drilling mechanism, a percussive motor having a relativelystationary cylinder and a reciprocable piston fitting in the borethereof, a drill steel percussively actuated by said motor, a secondmotor arranged at the rear end of said percussive motor and having acylinder coaxial with said first cylinder, a piston reciprocable thereinhaving an area subjected to constant pressure and an op osed area incommunication with one end o the cylinder of said percussive motor, andoperative drivino connections between said second piston and the drillsteel for rotion of said gear to said drill steel.

11. In a rock drilling mechanism, a percussive motor having a relativelystationary cylinder and a reciprocable piston fitting in the borethereof, a. drill steel percussively actuated by said motor, a secondreciprocating motor having a cylinder coaxial with said percussive motorcylinder, a piston reciprocable therein, a common cylinder head betweensaid cylinder and an aperture therethrough for establishing directcommunication between the same, and mechanismfor transformingreciprocating movement of said second piston to rotary movement and fortransmitting said rotary movement to. the drill steel.

In testimony whereof I affix my signature.

ELMER G. GARTIN.

